Out of all the question marks for Michigan's 2012 squad, perhaps the biggest are for the defensive line. After losing three starters, Michigan is looking for players to fill the roles formerly played by Mike Martin, Ryan Van Bergen, and Will Heininger. They have returning players at every position on the defensive line with game experience, but only one of the four spots has gotten a serious amount of confidence from fans. As a result, Michigan's defensive line progress could very likely determine the direction of the defense overall and the team's performance down the stretch.This is largely because Michigan has All-Big Ten prospects at just about every positional group on the offensive side and is returning just about everybody that started at linebacker or in the secondary last year as well. Add in the fact that both of the specialists return and Michigan looks like a pretty good squad for 2012, assuming the defensive line can progress. In my opinion, this is the position group that will determine the type of season Michigan will have in 2012. Not only because it has the most question marks, but also because of the way it produced in 2011 in route to the Sugar Bowl victory. Key red zone stops, key stops on 3rd and short, and a plethora of turnovers during the course of the season. Making up for that is going to be a challenge, so let's start breaking down who has a chance at doing it in 2012.
